For APInt::z/sext(width), if width == BitWidth, just return *this.

llvm-svn: 35065

1 files changed, 4 insertions, 0 deletions

diff --git a/llvm/lib/Support/APInt.cpp b/llvm/lib/Support/APInt.cpp
index 08ec2362007..ae8f6e4e395 100644
--- a/llvm/lib/Support/APInt.cpp
+++ b/llvm/lib/Support/APInt.cpp
@@ -921,6 +921,8 @@ APInt &APInt::trunc(uint32_t width) {
 
 // Sign extend to a new width.
 APInt &APInt::sext(uint32_t width) {
+  if (width == BitWidth)
+    return *this;
   assert(width > BitWidth && "Invalid APInt SignExtend request");
   assert(width <= IntegerType::MAX_INT_BITS && "Too many bits");
   // If the sign bit isn't set, this is the same as zext.
@@ -969,6 +971,8 @@ APInt &APInt::sext(uint32_t width) {
 
 //  Zero extend to a new width.
 APInt &APInt::zext(uint32_t width) {
+  if (width == BitWidth)
+    return *this;
   assert(width > BitWidth && "Invalid APInt ZeroExtend request");
   assert(width <= IntegerType::MAX_INT_BITS && "Too many bits");
   uint32_t wordsBefore = getNumWords();